DaveH
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this^^^^^It's not tread wear that is causing the problem. It's the belts breaking and causing the tire to go egg shaped. Egg shaped tires cause problems. Nittos and BFGs are notorious for this. Sister had a F250 death shake violently. BFG tires had less than 12k miles and were the problem. Bad tires cause problems.
If a broken belt tire causes wheel hop and axle shake on a trailer, think of what it's doing to a steering axle. The problem isn't the steering stabilizer as they don't install those on trailers to fix that axle shake.
Steering stabilizers are a band aid, really just don't do anything, and are worthless. Steering problems are from bad engineering. Steering stabilizer doesn't correct engineering mistakes. Get new tires on it or at least have the dealer confirm the condition of the tires and have them show you the balancing sheet.
had my chevy HD pickup do this. the BFG's had about 20% treadlife left but a violent shaking around 60mph kicked in. tires LOOKED ok....but once dismounted you could see on the inside where the belts had separated and the tire was even taking on an egg shaped out of round condition.
put new tires on it,
as for considering a 4 runner...recently got a 22 TRD....really nice....decent (but not great) fuel economy. its underpowered for towing. i use it for some light load towing stuff (like MAYBE 2500lbs) and it does OK but that's it.